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Oil sludge or black sludge is a gel-like or semi-solid deposit inside an internal combustion engine, that can create a catastrophic buildup. It is often the result of contaminated engine oil and occurs when moisture and/or high heat is introduced to engine oil.
A crewman on board a World War 2 Royal Air Force Vickers Wellington bomber. The container to the right of him is the aircraft's "Elsan" chemical toilet (1939–1941) Early aircraft fitted with a toilet include the 1919 Handley Page Type W, the 1921 DH.29 Doncaster and the 1921 Caproni Ca.60. [1]